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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2013-05-29 12:45:09 +0400
committerJiri Kosina <jkosina@suse.cz>2013-06-12 13:13:38 +0400
commit5939212df87e9377dd3813904264b94a962d19ca (patch)
treeb3581025a057f97b140093c84e1cf2a6e890c4e7 /drivers/hid
parent1deb9d341d475ff84262e927d6c0e36fecb9942e (diff)
downloadlinux-5939212df87e9377dd3813904264b94a962d19ca.tar.xz
HID: multitouch: prevent memleak with the allocated name
mt_free_input_name() was never called during .remove(): hid_hw_stop() removes the hid_input items in hdev->inputs, and so the list is therefore empty after the call. In the end, we never free the special names that has been allocated during .probe(). Restore the original name before freeing it to avoid acessing already freed pointer. This fixes a regression introduced by 49a5a827a ("HID: multitouch: append " Pen" to the name of the stylus input") Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-multitouch.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index dc3ae5c56f56..d39a5cede0b0 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -264,9 +264,12 @@ static struct mt_class mt_classes[] = {
static void mt_free_input_name(struct hid_input *hi)
{
struct hid_device *hdev = hi->report->device;
+ const char *name = hi->input->name;
- if (hi->input->name != hdev->name)
- kfree(hi->input->name);
+ if (name != hdev->name) {
+ hi->input->name = hdev->name;
+ kfree(name);
+ }
}
static ssize_t mt_show_quirks(struct device *dev,
@@ -1040,11 +1043,11 @@ static void mt_remove(struct hid_device *hdev)
struct hid_input *hi;
sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
- hid_hw_stop(hdev);
-
list_for_each_entry(hi, &hdev->inputs, list)
mt_free_input_name(hi);
+ hid_hw_stop(hdev);
+
kfree(td);
hid_set_drvdata(hdev, NULL);
}